Re: Label

For text to be centered, the width of the Label must be set. You can set it to percent value or points with percentWidth or width properties.
var _sln:Label = new Label();
_sln.text = _uofsModel.tempLessonTestResults.aUofS[i];
_sln.setStyle("textAlign", "center");
_sin.percentWidth = 100;
_bgs.addElement(_sln);
Using 100% width will center it in the parent container's x axis.